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Circuit and method for measuring resistance value of resistive element

A resistance element, a technology for measuring resistance, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, using directly heat-sensitive electric/magnetic elements, etc.

Inactive Publication Date: 2017-07-28
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] On the other hand, PTC thermistors allow more accurate measurements at low temperatures, but are more expensive than NTC thermistors

Method used

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  • Circuit and method for measuring resistance value of resistive element
  • Circuit and method for measuring resistance value of resistive element
  • Circuit and method for measuring resistance value of resistive element

Examples

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no. 1 example

[0081] figure 1 A first embodiment of the invention is shown, which includes a method for measuring the resistance value R of the resistive element 2 TH Circuit 1.

[0082] Resistive element 2 is connected in series to have a known resistance value R PU The pull-up resistor 3 to form a voltage divider 4.

[0083] In order to achieve this purpose, the first voltage value V P Provided to the free terminal 3' of the pull-up resistor 3, and the lower second voltage value V N Provided to the free end 2 ′ of the resistive element 2 .

[0084] At the common node 5 of the resistive element 2 and the pull-up resistor 3, the voltage divider 4 produces a voltage signal V that can be calculated according to the following formula S :

[0085]

[0086] The common node 5 is connected to a first input of an adder 6 whose output is connected to the input of a generator pulse width modulation circuit 100 to generate a pulse width modulated (PWM) signal V PWM . The output of the pulse...

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PUM

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Abstract

A method for measuring the resistance value RTH of a resistive element, comprising connecting a pull-up resistor with a known resistance value in series to the element and providing a first voltage value VP to the free end of the pull-up resistor, and a second lower resistance value VN to the free end of the component; monitor a signal representing the resistance value between the component and the pull-up resistor; determine the difference between the monitored signal and the generated signal PWM Difference, the signal having VP and VN as high and low voltage values ​​respectively; integrating the difference over time to obtain the signal; varying the PWM signal based on changes in the output signal over time the load cycle; obtain the value of the load cycle of the PWM signal; determine the resistance value of the resistive element based on the load cycle value and the pull-up resistor value. This measurement circuit is also provided.

Description

technical field [0001] The invention relates to a circuit for measuring the resistance of a resistive element, such as a PTC or NTC thermistor sensor for monitoring temperature values ​​in a vehicle system. Background technique [0002] It is known that modern vehicle systems are traditionally equipped with a plurality of resistive sensors for monitoring the temperature values ​​of various components in the vehicle system. [0003] Currently, commonly used resistance temperature sensors are negative temperature coefficient thermistors (NTC) or positive temperature coefficient thermistors (PTC). [0004] The measurement of the temperature value typically uses a voltage divider present in a pull-up resistor, having a known resistance value, connected in series at a common node to the resistive sensor. Two different voltage values ​​are respectively supplied to the free ends of the voltage divider to generate an analog signal representing the resistance of the resistive sensor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02
CPCG01K7/24G01R15/04G01R27/02
Inventor S.尼杜F.奥蒂里
Owner GM GLOBAL TECH OPERATIONS LLC